The current mechanism is unnecessarily complex. Simplify the whole mechanism such that the entire fitImage is signed, IVT is placed at the end, followed by CSF, and this entire bundle is also authenticated. This makes the signing scripting far simpler.

Signed-off-by: Marek Vasut marex@denx.de --- Cc: "NXP i.MX U-Boot Team" uboot-imx@nxp.com Cc: Fabio Estevam festevam@denx.de Cc: Heiko Schocher hs@denx.de Cc: Heinrich Schuchardt xypron.glpk@gmx.de Cc: Rasmus Villemoes rasmus.villemoes@prevas.dk Cc: Simon Glass sjg@chromium.org Cc: Stefano Babic sbabic@denx.de Cc: Tom Rini trini@konsulko.com Cc: Ye Li ye.li@nxp.com --- arch/arm/dts/imx8mm-u-boot.dtsi | 2 + arch/arm/dts/imx8mn-u-boot.dtsi | 2 + arch/arm/dts/imx8mp-u-boot.dtsi | 2 + arch/arm/dts/imx8mq-u-boot.dtsi | 2 + arch/arm/mach-imx/spl.c | 65 ++++++---------- common/spl/spl_fit.c | 7 -- doc/imx/habv4/csf_examples/mx8m/csf.sh | 28 ++----- doc/imx/habv4/csf_examples/mx8m/csf_fit.txt | 10 +-- doc/imx/habv4/guides/mx8m_spl_secure_boot.txt | 74 ++++--------------- include/spl.h | 6 -- 10 files changed, 51 insertions(+), 147 deletions(-)

diff --git a/arch/arm/dts/imx8mm-u-boot.dtsi b/arch/arm/dts/imx8mm-u-boot.dtsi index 7fd5a05fad3..035282bf0b0 100644 --- a/arch/arm/dts/imx8mm-u-boot.dtsi +++ b/arch/arm/dts/imx8mm-u-boot.dtsi @@ -81,7 +81,9 @@

fit { description = "Configuration to load ATF before U-Boot"; +#ifndef CONFIG_IMX_HAB fit,external-offset = <CONFIG_FIT_EXTERNAL_OFFSET>; +#endif fit,fdt-list = "of-list"; #address-cells = <1>;

diff --git a/arch/arm/dts/imx8mn-u-boot.dtsi b/arch/arm/dts/imx8mn-u-boot.dtsi index cef20dab468..5046b38e4e2 100644 --- a/arch/arm/dts/imx8mn-u-boot.dtsi +++ b/arch/arm/dts/imx8mn-u-boot.dtsi @@ -145,7 +145,9 @@

fit { description = "Configuration to load ATF before U-Boot"; +#ifndef CONFIG_IMX_HAB fit,external-offset = <CONFIG_FIT_EXTERNAL_OFFSET>; +#endif fit,fdt-list = "of-list"; #address-cells = <1>;

diff --git a/arch/arm/dts/imx8mp-u-boot.dtsi b/arch/arm/dts/imx8mp-u-boot.dtsi index 18d1728e1d2..68cd0e10f02 100644 --- a/arch/arm/dts/imx8mp-u-boot.dtsi +++ b/arch/arm/dts/imx8mp-u-boot.dtsi @@ -103,7 +103,9 @@

fit { description = "Configuration to load ATF before U-Boot"; +#ifndef CONFIG_IMX_HAB fit,external-offset = <CONFIG_FIT_EXTERNAL_OFFSET>; +#endif fit,fdt-list = "of-list"; #address-cells = <1>;

diff --git a/arch/arm/dts/imx8mq-u-boot.dtsi b/arch/arm/dts/imx8mq-u-boot.dtsi index b3fef862b49..90b2274754b 100644 --- a/arch/arm/dts/imx8mq-u-boot.dtsi +++ b/arch/arm/dts/imx8mq-u-boot.dtsi @@ -97,7 +97,9 @@

fit { description = "Configuration to load ATF before U-Boot"; +#ifndef CONFIG_IMX_HAB fit,external-offset = <CONFIG_FIT_EXTERNAL_OFFSET>; +#endif #address-cells = <1>;

images { diff --git a/arch/arm/mach-imx/spl.c b/arch/arm/mach-imx/spl.c index cb9801b7a13..6709f50ad64 100644 --- a/arch/arm/mach-imx/spl.c +++ b/arch/arm/mach-imx/spl.c @@ -20,6 +20,7 @@ #include <asm/mach-imx/boot_mode.h> #include <g_dnl.h> #include <linux/libfdt.h> +#include <memalign.h>

DECLARE_GLOBAL_DATA_PTR;

@@ -315,47 +316,17 @@ ulong board_spl_fit_size_align(ulong size) size = ALIGN(size, 0x1000); size += CONFIG_CSF_SIZE;

- return size; -} + if (size > CONFIG_SYS_BOOTM_LEN) + panic("spl: ERROR: image too big\n");

-void board_spl_fit_post_load(const void *fit) -{ - u32 offset = ALIGN(fdt_totalsize(fit), 0x1000); - - if (imx_hab_authenticate_image((uintptr_t)fit, - offset + IVT_SIZE + CSF_PAD_SIZE, - offset)) { - panic("spl: ERROR: image authentication unsuccessful\n"); - } + return size; } #endif

void *board_spl_fit_buffer_addr(ulong fit_size, int sectors, int bl_len) { - int align_len = ARCH_DMA_MINALIGN - 1; - - /* Some devices like SDP, NOR, NAND, SPI are using bl_len =1, so their fit address - * is different with SD/MMC, this cause mismatch with signed address. Thus, adjust - * the bl_len to align with SD/MMC. - */ - if (bl_len < 512) - bl_len = 512; - - return (void *)((CONFIG_TEXT_BASE - fit_size - bl_len - - align_len) & ~align_len); -} -#endif - -#if defined(CONFIG_MX6) && defined(CONFIG_SPL_OS_BOOT) -int dram_init_banksize(void) -{ - gd->bd->bi_dram[0].start = CFG_SYS_SDRAM_BASE; - gd->bd->bi_dram[0].size = imx_ddr_size(); - - return 0; + return (void *)CONFIG_SPL_LOAD_FIT_ADDRESS; } -#endif - /* * read the address where the IVT header must sit * from IVT image header, loaded from SPL into @@ -365,7 +336,6 @@ int dram_init_banksize(void) void *spl_load_simple_fit_fix_load(const void *fit) { struct ivt *ivt; - unsigned long new; unsigned long offset; unsigned long size; u8 *tmp = (u8 *)fit; @@ -375,16 +345,23 @@ void *spl_load_simple_fit_fix_load(const void *fit) size = board_spl_fit_size_align(size); tmp += offset; ivt = (struct ivt *)tmp; - if (ivt->hdr.magic != IVT_HEADER_MAGIC) { - debug("no IVT header found\n"); - return (void *)fit; - } + debug("%s: ivt: %p offset: %lx size: %lx\n", __func__, ivt, offset, size); debug("%s: ivt self: %x\n", __func__, ivt->self); - new = ivt->self; - new -= offset; - debug("%s: new %lx\n", __func__, new); - memcpy((void *)new, fit, size);

- return (void *)new; + if (imx_hab_authenticate_image((uintptr_t)fit, (uintptr_t)ivt, offset)) + panic("spl: ERROR: image authentication unsuccessful\n"); + + return (void *)fit; } +#endif /* CONFIG_IMX_HAB */ + +#if defined(CONFIG_MX6) && defined(CONFIG_SPL_OS_BOOT) +int dram_init_banksize(void) +{ + gd->bd->bi_dram[0].start = CFG_SYS_SDRAM_BASE; + gd->bd->bi_dram[0].size = imx_ddr_size(); + + return 0; +} +#endif diff --git a/common/spl/spl_fit.c b/common/spl/spl_fit.c index c51482b3b65..730639f7562 100644 --- a/common/spl/spl_fit.c +++ b/common/spl/spl_fit.c @@ -27,10 +27,6 @@ struct spl_fit_info { int conf_node; /* FDT offset to selected configuration node */ };

-__weak void board_spl_fit_post_load(const void *fit) -{ -} - __weak ulong board_spl_fit_size_align(ulong size) { return size; @@ -829,8 +825,5 @@ int spl_load_simple_fit(struct spl_image_info *spl_image,

spl_image->flags |= SPL_FIT_FOUND;

- if (IS_ENABLED(CONFIG_IMX_HAB)) - board_spl_fit_post_load(ctx.fit); - return 0; } diff --git a/doc/imx/habv4/csf_examples/mx8m/csf.sh b/doc/imx/habv4/csf_examples/mx8m/csf.sh index 7a9a05e6339..5b383fa982f 100644 --- a/doc/imx/habv4/csf_examples/mx8m/csf.sh +++ b/doc/imx/habv4/csf_examples/mx8m/csf.sh @@ -37,29 +37,11 @@ dd if=csf_spl.bin of=flash.bin bs=1 seek=${spl_dd_offset} conv=notrunc

# 3) Sign u-boot.itb

-# fitImage tree -fit_block_base=$(printf "0x%x" $(( $(sed -n "/CONFIG_TEXT_BASE=/ s@.*=@@p" .config) - $(sed -n "/CONFIG_FIT_EXTERNAL_OFFSET=/ s@.*=@@p" .config) - 0x200 - 0x40)) ) +# fitImage +fit_block_base=$(printf "0x%x" $(sed -n "/CONFIG_SPL_LOAD_FIT_ADDRESS=/ s@.*=@@p" .config) ) fit_block_offset=$(printf "0x%s" $(fdtget -t x u-boot.dtb /binman/imx-boot/uboot offset)) -fit_block_size=$(printf "0x%x" $(( ( ($(fdtdump u-boot.itb 2>/dev/null | sed -n "/^...totalsize:/ s@.*(0x[0-9a-f]+).*@\1@p") + 0x1000 - 0x1 ) & ~(0x1000 - 0x1)) + 0x20 )) ) -sed -i "/Blocks = / s@.*@ Blocks = $fit_block_base $fit_block_offset $fit_block_size "flash.bin", \\@" csf_fit.tmp - -# U-Boot -uboot_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot load)) -uboot_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-position)) + ${fit_block_offset} ))) -uboot_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-size)) -sed -i "/0xuuuu/ s@.*@ $uboot_block_base $uboot_block_offset $uboot_block_size "flash.bin", \\@" csf_fit.tmp - -# ATF -atf_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf load)) -atf_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-position)) + ${fit_block_offset} ))) -atf_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-size)) -sed -i "/0xaaaa/ s@.*@ $atf_block_base $atf_block_offset $atf_block_size "flash.bin", \\@" csf_fit.tmp - -# DTB -dtb_block_base=$(printf "0x%x" $(( ${uboot_block_base} + ${uboot_block_size} ))) -dtb_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-position)) + ${fit_block_offset} ))) -dtb_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-size)) -sed -i "/0xdddd/ s@.*@ $dtb_block_base $dtb_block_offset $dtb_block_size "flash.bin"@" csf_fit.tmp +fit_block_size=$(printf "0x%x" $(( ( ( $(stat -tc %s u-boot.itb) + 0x1000 - 0x1 ) & ~(0x1000 - 0x1)) + 0x20 )) ) +sed -i "/Blocks = / s@.*@ Blocks = $fit_block_base $fit_block_offset $fit_block_size "flash.bin"@" csf_fit.tmp

# IVT ivt_ptr_base=$(printf "%08x" ${fit_block_base} | sed "s@(..)(..)(..)(..)@0x\4\3\2\1@") @@ -68,7 +50,7 @@ csf_block_base=$(printf "%08x" $(( ${fit_block_base} + ${fit_block_size} )) | se ivt_block_offset=$((${fit_block_offset} + ${fit_block_size} - 0x20)) csf_block_offset=$((${ivt_block_offset} + 0x20))

-echo "0xd1002041 ${ivt_ptr_base} 0x00000000 0x00000000 0x00000000 ${ivt_block_base} ${csf_block_base} 0x00000000" | xxd -r -p > ivt.bin +echo "0xd1002041 ${ivt_block_base} 0x00000000 0x00000000 0x00000000 ${ivt_block_base} ${csf_block_base} 0x00000000" | xxd -r -p > ivt.bin dd if=ivt.bin of=flash.bin bs=1 seek=${ivt_block_offset} conv=notrunc

# Generate CSF blob diff --git a/doc/imx/habv4/csf_examples/mx8m/csf_fit.txt b/doc/imx/habv4/csf_examples/mx8m/csf_fit.txt index cd1d4070a5e..bbb82f69448 100644 --- a/doc/imx/habv4/csf_examples/mx8m/csf_fit.txt +++ b/doc/imx/habv4/csf_examples/mx8m/csf_fit.txt @@ -26,11 +26,5 @@ [Authenticate Data] Verification index = 2 # FIXME: - # Line 1 -- fitImage tree - # Line 2 -- U-Boot u-boot-nodtb.bin blob - # Line 3 -- ATF BL31 blob - # Line 4 -- DT blob - Blocks = 0x401fcdc0 0x57c00 0xffff "flash.bin", \ - 0x40200000 0x62c00 0xuuuu "flash.bin", \ - 0x920000 0x00000 0xaaaa "flash.bin", \ - 0x40200000 0x00000 0xdddd "flash.bin" + # Line 1 -- fitImage + Blocks = 0x401fcdc0 0x57c00 0xffff "flash.bin" diff --git a/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt b/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt index 3e3d38440f9..e79726bf2c5 100644 --- a/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt +++ b/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt @@ -79,18 +79,16 @@ code within it:

The diagram below illustrate a signed U-Boot binary, DT blob and external ATF BL31 blob combined to form fitImage part of flash.bin container layout. -The *load_address is derived from CONFIG_TEXT_BASE such that the U-Boot -binary *start is placed exactly at CONFIG_SPL_TEXT_BASE in DRAM, however the -SPL moves the fitImage tree further to location: - *load_address = CONFIG_SPL_TEXT_BASE - CONFIG_FIT_EXTERNAL_OFFSET (=12kiB) - - 512 Byte sector - sizeof(mkimage header) +The *load_address is CONFIG_SPL_LOAD_FIT_ADDRESS, the fitImage is loaded +including all of its embedded data, authenticated using IVT+CSF concatenated +at the end of the fitImage at offset aligned to 4 kiB. The fitImage with +external data is not supported.

------- +-----------------------------+ <-- *load_address ^ | | | | fitImage tree | - | | with external data at | - | | offset 12 kiB from tree | - | | (cca. 1 kiB) | + | | with embedded data | + | | (cca. 1 MiB) | Signed | | | .----- Tree | +-----------------------------+ | Data | | Padding to next 4k aligned | @@ -101,34 +99,9 @@ SPL moves the fitImage tree further to location: | ------- +-----------------------------+ <-- *csf | | Command Sequence File (CSF) | | | for all signed entries in | - >--------------->| the fitImage, tree and data | - | | (cca 6-7 kiB) | - | +-----------------------------+ - | | Padding to 12 kiB offset | - | | from *load_address | - | ------- +-----------------------------+ <-- *start - | ^ | | - | Signed | | | - |---- Payload | | U-Boot external data blob | - | Data | | | - | v | | - | ------- +-----------------------------+ - | | Padding to 4 Bytes | - | ------- +-----------------------------+ - | ^ | | - | Signed | | | - |---- Payload | | ATF external data blob | - | Data | | | - | v | | - | ------- +-----------------------------+ - | | Padding to 4 Bytes | - | ------- +-----------------------------+ - | ^ | | - | Signed | | | - '---- Payload | | DTB external data blob | - Data | | | - v | | - ------- +-----------------------------+ + '---------------->| the fitImage, tree and data | + | (cca 6-7 kiB) | + +-----------------------------+

The diagram below illustrate a combined flash.bin container layout:

@@ -202,29 +175,11 @@ dd if=csf_spl.bin of=flash.bin bs=1 seek=${spl_dd_offset} conv=notrunc

CSF "Blocks" line for csf_fit.txt can be generated as follows: ``` -# fitImage tree -fit_block_base=$(printf "0x%x" $(( $(sed -n "/CONFIG_TEXT_BASE=/ s@.*=@@p" .config) - $(sed -n "/CONFIG_FIT_EXTERNAL_OFFSET=/ s@.*=@@p" .config) - 0x200 - 0x40)) ) +# fitImage +fit_block_base=$(printf "0x%x" $(sed -n "/CONFIG_SPL_LOAD_FIT_ADDRESS=/ s@.*=@@p" .config) ) fit_block_offset=$(printf "0x%s" $(fdtget -t x u-boot.dtb /binman/imx-boot/uboot offset)) -fit_block_size=$(printf "0x%x" $(( ( $(fdtdump u-boot.itb 2>/dev/null | sed -n "/^...totalsize:/ s@.*(0x[0-9a-f]+).*@\1@p") + 0x1000 - 0x1 ) & ~(0x1000 - 0x1) + 0x20 )) ) -sed -i "/Blocks = / s@.*@ Blocks = $fit_block_base $fit_block_offset $fit_block_size "flash.bin", \\@" csf_fit.tmp - -# U-Boot -uboot_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot load)) -uboot_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-position)) + ${fit_block_offset} ))) -uboot_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/uboot data-size)) -sed -i "/0xuuuu/ s@.*@ $uboot_block_base $uboot_block_offset $uboot_block_size "flash.bin", \\@" csf_fit.tmp - -# ATF -atf_block_base=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf load)) -atf_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-position)) + ${fit_block_offset} ))) -atf_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/atf data-size)) -sed -i "/0xaaaa/ s@.*@ $atf_block_base $atf_block_offset $atf_block_size "flash.bin", \\@" csf_fit.tmp - -# DTB -dtb_block_base=$(printf "0x%x" $(( ${uboot_block_base} + ${uboot_block_size} ))) -dtb_block_offset=$(printf "0x%x" $(( $(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-position)) + ${fit_block_offset} ))) -dtb_block_size=$(printf "0x%s" $(fdtget -t x u-boot.itb /images/fdt-1 data-size)) -sed -i "/0xdddd/ s@.*@ $dtb_block_base $dtb_block_offset $dtb_block_size "flash.bin"@" csf_fit.tmp +fit_block_size=$(printf "0x%x" $(( ( ( $(stat -tc %s u-boot.itb) + 0x1000 - 0x1 ) & ~(0x1000 - 0x1)) + 0x20 )) ) +sed -i "/Blocks = / s@.*@ Blocks = $fit_block_base $fit_block_offset $fit_block_size "flash.bin"@" csf_fit.tmp ```

The fitImage part of flash.bin requires separate IVT. Generate the IVT and @@ -237,8 +192,9 @@ csf_block_base=$(printf "%08x" $(( ${fit_block_base} + ${fit_block_size} )) | se ivt_block_offset=$((${fit_block_offset} + ${fit_block_size} - 0x20)) csf_block_offset=$((${ivt_block_offset} + 0x20))

-echo "0xd1002041 ${ivt_ptr_base} 0x00000000 0x00000000 0x00000000 ${ivt_block_base} ${csf_block_base} 0x00000000" | xxd -r -p > ivt.bin +echo "0xd1002041 ${ivt_block_base} 0x00000000 0x00000000 0x00000000 ${ivt_block_base} ${csf_block_base} 0x00000000" | xxd -r -p > ivt.bin dd if=ivt.bin of=flash.bin bs=1 seek=${ivt_block_offset} conv=notrunc +```

To generate CSF signature for the fitImage part of flash.bin container, use CST: ``` diff --git a/include/spl.h b/include/spl.h index 7e0f5ac63b0..98f57328a53 100644 --- a/include/spl.h +++ b/include/spl.h @@ -871,12 +871,6 @@ void spl_invoke_opensbi(struct spl_image_info *spl_image); int board_return_to_bootrom(struct spl_image_info *spl_image, struct spl_boot_device *bootdev);

-/** - * board_spl_fit_post_load - allow process images after loading finished - * @fit: Pointer to a valid Flattened Image Tree blob - */ -void board_spl_fit_post_load(const void *fit); - /** * board_spl_fit_size_align - specific size align before processing payload *